Abstract
The very late antigens, VLA-4 and VLA-5 belong to the β1 subfamily of integrins and have been identified as receptors for different binding regions of fibronectin (FN). We have detected VLA-4 and VLA-5, but not VLA-3 and VLA-6 expressed on human CD3+ CD4- CD8- γδTCR T cells by flow cytometry. Binding assays, performed on FN-coated plates, showed that activated CD25high (IL-2 receptor) but not resting CD25low γδT cells specifically adhere to FN. The binding capacity is inhibited by the synthetic peptide GRGDSP which inhibits adhesion mediated by VLA-5 and a functional mAb directed against the α4 subunit. Most FN binding is mediated by VLA-4. Additionally, resting γδ T cells cultured on coimmobilized anti-TCRδ1 mAb and FN or the 40 kDa fragment (which contains the adhesion site in the IIICS domain recognized by VLA-4) for 96 h in the absence of exogeneous IL-2 showed significant increase in proliferation when compared to that of resting γδ T cells cultured on immobilized anti-TCRδ1 mAb alone. Also expression of CD25 was significantly enhanced on cells cultured on coimmobilized anti-TCRδ1 mAb and FN, indicative of T cell activation. Cross-linking of VLA-4 and VLA-5 molecules costimulated expansion of resting γδ T cells induced by cross-linked TCRδ1. These results suggest that the γδ T cell β1 integrins, VLA-4 and VLA-5, may function in a dual capacity as signalling and adhesion molecules.
Original language | English (US) |
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Pages (from-to) | 101-108 |
Number of pages | 8 |
Journal | Immunology Letters |
Volume | 35 |
Issue number | 2 |
DOIs | |
State | Published - 1993 |
Externally published | Yes |
Keywords
- Costimulation
- Human γδ TCR
- β1 Integrins
ASJC Scopus subject areas
- Immunology
- Immunology and Allergy